OPTOISOLATED DC-DC
in [Design]
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From: Grant on 29 Apr 2010 16:52 On Thu, 29 Apr 2010 11:09:42 -0700, Joerg <invalid(a)invalid.invalid> wrote: >Spehro Pefhany wrote: >> On Thu, 29 Apr 2010 07:37:08 -0700 (PDT), Johnny5 >> <dirtylogicdesigns(a)gmail.com> wrote: >> >>> Gentlemen, I was curious on any ideas of an opto dc-dc converter >>> providing 20mA. Small footprint and heighth.. >>> Any ideas? Please and Thank You. >>> >>> VIN-8-16VDC >>> VOUT 5VDC 20mA, >> >> It's certainly possible (since you don't specify efficiency), but it >> probably would cost in the thousands of dollars. JDS Uniphase might be >> a place to start. It could well be a practical solution for such >> challenging problems as powering instrumentation that's at 100's of kV >> potential relative to ground. >> > >Even that I'd try to power magnetically through some porcelain or glass >insulation. Acoustic coupling through capacitor-like ceramic thingy -- used on high kV isolated instrumentation amps? Opto power is very low transfer efficiency. Grant. -- http://bugs.id.au/
From: Joerg on 29 Apr 2010 17:14 Grant wrote: > On Thu, 29 Apr 2010 11:09:42 -0700, Joerg <invalid(a)invalid.invalid> wrote: > >> Spehro Pefhany wrote: >>> On Thu, 29 Apr 2010 07:37:08 -0700 (PDT), Johnny5 >>> <dirtylogicdesigns(a)gmail.com> wrote: >>> >>>> Gentlemen, I was curious on any ideas of an opto dc-dc converter >>>> providing 20mA. Small footprint and heighth.. >>>> Any ideas? Please and Thank You. >>>> >>>> VIN-8-16VDC >>>> VOUT 5VDC 20mA, >>> It's certainly possible (since you don't specify efficiency), but it >>> probably would cost in the thousands of dollars. JDS Uniphase might be >>> a place to start. It could well be a practical solution for such >>> challenging problems as powering instrumentation that's at 100's of kV >>> potential relative to ground. >>> >> Even that I'd try to power magnetically through some porcelain or glass >> insulation. > > Acoustic coupling through capacitor-like ceramic thingy -- used on high kV > isolated instrumentation amps? > Yes, you can possibly use ultrasonic transformers. Unfortunately they have remained boutique parts, probably quite expensive. > Opto power is very low transfer efficiency. > -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: John Larkin on 29 Apr 2010 17:48 On Thu, 29 Apr 2010 13:33:03 -0700, Joerg <invalid(a)invalid.invalid> wrote: >John Larkin wrote: >> On Thu, 29 Apr 2010 11:58:40 -0700, Joerg <invalid(a)invalid.invalid> >> wrote: >> >>> hamilton wrote: >>>> On 4/29/2010 12:09 PM, Joerg wrote: >>>>> Spehro Pefhany wrote: >>>>>> On Thu, 29 Apr 2010 07:37:08 -0700 (PDT), Johnny5 >>>>>> <dirtylogicdesigns(a)gmail.com> wrote: >>>>>> >>>>>>> Gentlemen, I was curious on any ideas of an opto dc-dc converter >>>>>>> providing 20mA. Small footprint and heighth.. >>>>>>> Any ideas? Please and Thank You. >>>>>>> >>>>>>> VIN-8-16VDC >>>>>>> VOUT 5VDC 20mA, >>>>>> It's certainly possible (since you don't specify efficiency), but it >>>>>> probably would cost in the thousands of dollars. JDS Uniphase might be >>>>>> a place to start. It could well be a practical solution for such >>>>>> challenging problems as powering instrumentation that's at 100's of kV >>>>>> potential relative to ground. >>>>> Even that I'd try to power magnetically through some porcelain or glass >>>>> insulation. >>>>> >>>> That's not opto isolation, its magnetic, right ?? >>>> >>> Yes, just meant as a hint that you can do this stuff at high isolation >>> voltages. >>> >>> >>>> So the OPs request is not feasible. >>>> >>> Maybe feasible but it gets expensive. >>> >>>> hamilton >>>> >>>> PS: OK, solar cells maybe. >>> >>> With small footprint and height that can become a challenge. >> >> >> Motor. Long fiberglass rod. Generator. Megavolts of isolation. >> >... minor imbalance, some rumbling is heard, bigger imbalance, snapping >noise, stuff flying about, hissing, amperage stench develops, siren >begins to wail, the captain from engine company 89 hollers something, >his guys hurriedly don their helmets ... > >:-) You would enjoy that, wouldn't you? John
From: Michael A. Terrell on 29 Apr 2010 18:05 John Larkin wrote: > > On Fri, 30 Apr 2010 01:43:19 +1000, "Phil Allison" <phil_a(a)tpg.com.au> > wrote: > > > > >"Johnny5" <dirtylogicdesigns(a)gmail.com > > > > > >** Google Monkey alert !! > > > > > >> Gentlemen, I was curious on any ideas of an opto dc-dc converter > >> providing 20mA. Small footprint and heighth.. > >> Any ideas? Please and Thank You. > >> > >> VIN-8-16VDC > >> VOUT 5VDC 20mA, > > > > > >** Ever though of using solar cells and a 12 volt lamp ?? > > > > > > Done carefully, that might approach 1% efficiency. That's still a lot higher than dimbulb's efficiency. -- Anyone wanting to run for any political office in the US should have to have a DD214, and a honorable discharge.
From: Jan Panteltje on 29 Apr 2010 19:25
On a sunny day (Thu, 29 Apr 2010 13:27:16 -0700) it happened John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote in <dqqjt5tded693q7b3oifcq9hm92volte6e(a)4ax.com>: >On Thu, 29 Apr 2010 11:58:40 -0700, Joerg <invalid(a)invalid.invalid> >wrote: > >>hamilton wrote: >>> On 4/29/2010 12:09 PM, Joerg wrote: >>>> Spehro Pefhany wrote: >>>>> On Thu, 29 Apr 2010 07:37:08 -0700 (PDT), Johnny5 >>>>> <dirtylogicdesigns(a)gmail.com> wrote: >>>>> >>>>>> Gentlemen, I was curious on any ideas of an opto dc-dc converter >>>>>> providing 20mA. Small footprint and heighth.. >>>>>> Any ideas? Please and Thank You. >>>>>> >>>>>> VIN-8-16VDC >>>>>> VOUT 5VDC 20mA, >>>>> >>>>> It's certainly possible (since you don't specify efficiency), but it >>>>> probably would cost in the thousands of dollars. JDS Uniphase might be >>>>> a place to start. It could well be a practical solution for such >>>>> challenging problems as powering instrumentation that's at 100's of kV >>>>> potential relative to ground. >>>> >>>> Even that I'd try to power magnetically through some porcelain or glass >>>> insulation. >>>> >>> That's not opto isolation, its magnetic, right ?? >>> >> >>Yes, just meant as a hint that you can do this stuff at high isolation >>voltages. >> >> >>> So the OPs request is not feasible. >>> >> >>Maybe feasible but it gets expensive. >> >>> hamilton >>> >>> PS: OK, solar cells maybe. >> >> >>With small footprint and height that can become a challenge. > > >Motor. Long fiberglass rod. Generator. Megavolts of isolation. > >John Well, been thinking: Motor, belt, generator. It is not optical, but OK, if the belt is isolating you get a very good efficiency :-) |